[m-rev.] diff: lookup switches and ground terms

[Zoltan Somogyi]

compiler/lookup_util.m:
	Count from_ground_term_construct scopes as unifications for the purpose
	of determining whether a switch arm can be implemented by a table
	lookup.

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Index: compiler/lookup_util.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/lookup_util.m,v
retrieving revision 1.9
diff -u -b -r1.9 lookup_util.m
--- compiler/lookup_util.m	6 Jan 2009 03:56:26 -0000	1.9
+++ compiler/lookup_util.m	11 Jan 2009 00:37:28 -0000
@@ -36,7 +36,8 @@
 :- pred figure_out_output_vars(code_info::in, hlds_goal_info::in,
     list(prog_var)::out) is det.
 
-    % Is the input goal a conjunction of unifications?
+    % Is the input goal a conjunction of unifications? A
+    % from_ground_term_construct scope counts as a unification.
     %
 :- pred goal_is_conj_of_unify(hlds_goal::in) is semidet.
 
@@ -131,7 +132,12 @@
     % We could allow calls as well. Some procedures have an output inst
     % that fixes the value of the output variable, which is thus a constant.
     % However, calls to such procedures should have been inlined by now.
-    GoalExpr = unify(_, _, _, _, _),
+    (
+        GoalExpr = unify(_, _, _, _, _)
+    ;
+        GoalExpr = scope(Reason, _),
+        Reason = from_ground_term(_, from_ground_term_construct)
+    ),
     only_constant_goals(Goals).
 
 generate_constants_for_arm(Goal, Vars, StoreMap, !MaybeEnd, CaseRvals,
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